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Fix for pandas.merge wrong overload handling of 'on' args (#99)
Problem description: merge_overload and merge_asof_overload functions use 'on' argument value to compute 'left_on' and 'right_on' arguments in a way that breaks type stability, causing compilation failure when 'on' is assigned a StringLiteral value. Error: File "../hpat/hiframes/dataframe_pass.py", line 202, in _run_assign return self._run_call(assign, lhs, rhs) File "../hpat/hiframes/dataframe_pass.py", line 522, in _run_call return self._run_call_join(assign, lhs, rhs) File "../hpat/hiframes/dataframe_pass.py", line 1488, in _run_call_join left_on = self._get_const_or_list(left_on_var) File "../hpat/hiframes/dataframe_pass.py", line 2135, in _get_const_or_list raise ValueError(err_msg) ValueError: Failed in hpat mode pipeline (step: typed dataframe pass) None Following tests should be fixed with this commit: test_join_cat1 (hpat.tests.test_join.TestJoin) test_join_cat2 (hpat.tests.test_join.TestJoin) test_join_cat_parallel1 (hpat.tests.test_join.TestJoin) test_join_datetime_seq1 (hpat.tests.test_join.TestJoin) test_join_left_seq1 (hpat.tests.test_join.TestJoin) test_join_left_seq2 (hpat.tests.test_join.TestJoin) test_join_outer_seq1 (hpat.tests.test_join.TestJoin) test_join_right_seq1 (hpat.tests.test_join.TestJoin) test_merge_asof_seq1 (hpat.tests.test_join.TestJoin)
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